2017 kymco K-pipe 125cc idling issues? Advice anyone?

[Vector Seven]

Hello, just purchased my brand new 2017 K-pipe 125. Once i got it stated it kept stalling out. I was able to fiddle with the choke leaver and got it to idle high enough to  go for my first ride (ever one a two wheeled vehicle.) Unfortunately after riding for a while the Rpms would rev to like for grand intermittently. im guessing from my experience with carbonated engines that it just needs to be run more than the first 5 mile i put on it. Any relevant advice would be helpful . Thanks.

[AMAC1680]

Could be the bubbles.....

AMAC

[Redk]

In any NEW machine there is a probability of grit or debris from the manufacturing process within the fuel system.
With the smallest of engines, tiny amounts will affect jets and their adjustment.
Dis-assembly and flushing should have been part of the dealer setup process.
Since yours is brand new, I'd ask them to make it good.
redk

[woodsrat]

Unfortunately there's only one adjustment on the K-Pipe's carburetor, the idle screw.  According to the shop manual I have it's supposed to be set at around 1600 RPM which is a bit high for my taste but that's what they call for.

You'll likely need an accurate inductive tachometer to know what kind of RPM the engine is turning.  Just for tuning purposes I added a $15 one-wire tach/hour meter and eventually I plan to remove it.  Installing it is a piece of cake--you just wrap the wire around the spark plug cable a few turns.

The cap covering the mixture screw can be easily removed (it's held on with a soft glue similar to Silicone Seal) but once off you won't be greeted with a normal slotted screw head.  Instead what you'll find is more akin to a 3/4 moon.  I was able to move mine with a small screwdriver and a pair of needle nose pliers.  A bit of carburetor cleaner will dissolve the remaining adhesive and once removed you can cut a small slot in it for a screwdriver.  I'd start about 1 1/2 turns out.

Other things to check might be the air cleaner to make sure it's not over oiled.  What Redk said is also true.  Gasoline is filthy nowadays but the K-Pipe does have a filter stock.

As mentioned on the "2016 K-Pipe Owner" thread on page 3 I replaced the stock carb and airbox with an inexpensive Mikuni carb and air cleaner from eBay.  Doing this will allow unlimited tuning ability as well as quick warm ups.  I can light mine up, ride it away and be able to turn off the "choke" (actually an enrichening circuit on the Mikuni) before I get a quarter of a mile away.  There might even be a performance increase but without a dyno or another K-Pipe to run it against it's hard for me to tell.

I do like the simplicity of the Mikuni carb and I've used it on several bikes with excellent results.  Several other buddies have the same carb on their step throughs and share the same sentiment.  Jetting is easy to obtain and without an air box it's extremely quick to access the carb for adjustment or maintenance.

[Redk]

Woodsrat, got a link for your choice of cheapo tachs ?
I'd like to play with one... just to see how the CVT thinks...
Tnx
redk

[woodsrat]

Here's an eBay item number for the one I'm using:   371554067074    $13.90

Note that there are a lot of different units out there and some don't have replaceable batteries or are programmable.  This one has both.

[Redk]

TY,
I shall check it shortly...
:-)
redk

[Redk]

WR, I dunno why I couldn't pull up that item number on the bay, but I got this one, which does have a battery in it, good for 3 to 5 years, they claim...



8 bucks shipped to my door out of the PI.

Worth it to me if it provides a little more information about what's going on under all the plastic !

:-)
redk

[Vector Seven]

Thank you all for your helpful advice. Safe riding out there.

[lilzip24]

Woodsrat, when you get a chance can you send me the parts list again for your Mikuni and airbox setup? I would greatly appreciate it sir

[souzamoto]

Did you buy this bike from a dealer? if so it should go back to the dealer to get it running correctly.
Are you in the USA?
CJS

[zephyrprime]

Unfortunately there's only one adjustment on the K-Pipe's carburetor, the idle screw.

Not true.  There is the idle screw and also a near by fuel/air mixture screw which is a single D shaped screw require that special screw driver to set.

Also, to address any one else with op's issue, my carb needed even though it was fresh off the showroom floor.  Take it back to the dealer to deal with it.